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92]. In the following sections we shall refer to these states as symmetric ones. 4 The direction of the decoherence We saw in the previous section that the interplay between decoherence and dissipation is reflected in the time evolution of the superpositions given by Eq. 10). 2). According to Sec. 1, the interaction with a large number of degrees of freedom selects naturally the so-called pointer basis [17] in the Hilbert-space of the system subject to decoherence. This process favors the constituent states of the pointer basis in the sense that the system is driven towards a classical statistical mixture of these states.

Figs. 6 c) and d) depict the situation after a time which is short in the sense that the 46 TWO-LEVEL ATOMS AND DECOHERENCE the shapes of the lobes of the coherent states are not appreciably affected (no dissipation), but the interference is already negligible between them, except for the single pair along the vertical edge of the tetrahedron. As it is seen from Fig. 15). The coherence between the components of this pair of states is nearly unaffected as shown by the strong oscillations. A qualitatively different stage of the time evolution is shown in Figs.

E. al. [92]. In the following sections we shall refer to these states as symmetric ones. 4 The direction of the decoherence We saw in the previous section that the interplay between decoherence and dissipation is reflected in the time evolution of the superpositions given by Eq. 10). 2). According to Sec. 1, the interaction with a large number of degrees of freedom selects naturally the so-called pointer basis [17] in the Hilbert-space of the system subject to decoherence. This process favors the constituent states of the pointer basis in the sense that the system is driven towards a classical statistical mixture of these states.

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